package com.example.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.example.common.BaseContent;
import com.example.common.R;
import com.example.domain.ShoppingCart;
import com.example.service.ShoppingCartService;
import com.sun.prism.impl.BaseContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 获取购物车的数据
     *
     * @return
     */
    @RequestMapping("/list")
    public R<List<ShoppingCart>> list() {
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContent.getThreadLocal());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }

    /**
     * 往购物车添加菜品
     *
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart) {
        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContent.getThreadLocal();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);

        if (dishId != null) {
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId, dishId);

        } else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null) {
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }

        return R.success(cartServiceOne);
    }


    /**
     * 减掉购物车某菜品数量
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> updateCartApi(@RequestBody ShoppingCart shoppingCart) {
        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContent.getThreadLocal();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, currentId);

        if (shoppingCart.getDishId() != null) {
            queryWrapper.eq(ShoppingCart::getDishId, shoppingCart.getDishId());
        }
        if (shoppingCart.getSetmealId() != null) {
            queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }

        //修改购物车数据
        ShoppingCart one = shoppingCartService.getOne(queryWrapper);
        if (one.getNumber() > 1) {
            one.setNumber(one.getNumber()-1);
            shoppingCartService.updateById(one);
        } else {
            shoppingCartService.removeById(one);
            one.setNumber(0);
        }


        return R.success(one);
    }

    /**
     * 清空购物车
     *
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean() {
        //SQL:delete from shopping_cart where user_id = ?

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContent.getThreadLocal());

        shoppingCartService.remove(queryWrapper);

        return R.success("清空购物车成功");
    }
}
